/*
*    Qizx/open 3.0 beta
*
* This code is the open-source version of Qizx.
* Copyright (C) 2004-2009 Axyana Software -- All rights reserved.
*
* The contents of this file are subject to the Mozilla Public License 
*  Version 1.1 (the "License"); you may not use this file except in 
*  compliance with the License. You may obtain a copy of the License at
*  http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
*  WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
*  for the specific language governing rights and limitations under the
*  License.
*
* The Initial Developer of the Original Code is Xavier Franc - Axyana Software.
*
*/
using System;
using EvaluationException = System.Qizx.Api.EvaluationException;
using EvalContext = System.Qizx.XQuery.EvalContext;
using ExprDisplay = System.Qizx.XQuery.ExprDisplay;
using Focus = System.Qizx.XQuery.Focus;
using ModuleContext = System.Qizx.XQuery.ModuleContext;
using XQType = System.Qizx.XQuery.XQType;
namespace System.Qizx.XQuery.Op
{
	
	/// <summary> Logical OR</summary>
	public class OrExpr:BooleanExpression
	{
		
		public Expression[] args;
		
		public OrExpr(Expression first)
		{
			args = new Expression[]{first};
		}
		
		public virtual void  addExpr(Expression e)
		{
			args = addExpr(args, e);
		}
		
		public override Expression Child(int rank)
		{
			return rank < args.Length?args[rank]:null;
		}
		
		public override void  Dump(ExprDisplay d)
		{
			d.header(this);
			for (int i = 0; i < args.Length; i++)
				d.child("op" + i, args[i]);
		}
		
		public override Expression StaticCheck(ModuleContext context, int flags)
		{
			for (int i = 0; i < args.Length; i++)
			{
				args[i] = context.staticCheck(args[i], 0);
			}
			type = XQType.BOOLEAN;
			return this;
		}
		
		public override bool evalAsBoolean(Focus focus, EvalContext context)
		{
			for (int i = 0; i < args.Length; i++)
				if (args[i].evalEffectiveBooleanValue(focus, context))
					return true;
			return false;
		}
	}
}